package com.zhoukx.netty.doubborpc.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class NettyClient {


   // 创建建成吃
    private  static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private  static  NettyClientHandler client;

    // 编写方法使用代理模式,获取代理对象
    public Object getBean(final Class<?> serviceClass,final String providerName){
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class[]{serviceClass},(proxy, method, args) -> {
                    // 客户端呢没吊用一次hello,就会进入到该代码块
                    if(client == null){
                        initClient();
                    }
                    // 设置发送给服务器端的信息
                    //providerName  协议头
                    // args 发送给服务器端的消息
                    client.setPara(providerName+args[0]);
                    return executor.submit(client).get();
                });
    }


    // 初始化客户端
    private  static  void initClient(){
        client = new NettyClientHandler();
        // 创建EventLoopGroup
        NioEventLoopGroup group = new NioEventLoopGroup();

        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
                        pipeline.addLast(new StringDecoder());
                        pipeline.addLast(new StringEncoder());
                        pipeline.addLast(client);
                    }
                });

        try {
            bootstrap.connect("127.0.0.1",7008).sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
